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On the left, a sketch by combat artist Lt. Alfred R. Waud of Bayard Wilkeson on horseback, directing the fire of the 4th U.S. Artillery against the Confederate ranks during the battle of Gettysburg, July 4, 1863.

On the right, a mounted Confederate reenactor takes part in a demonstration of a battle during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 28, 2013,

Credit: AP

Top: The rear view of the camp of Capt. John J. Hoff of the Union Army in Gettysburg, Pa., July 1865.

Bottom: Members of the 1st Tennessee wait to take part in a demonstration of a battle during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 28, 2013.

Credit: Library of Congress/AP

Top: A photo taken between Sept. 8, 1862 and June 6, 1963 of five soldiers of the 6th Regiment Massachusetts Volunteer Militia outfitted with enfield muskets in front of their camp.

Bottom: Reenactors portray Union soldiers in Murray's Brigade during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 27, 2013.

Credit: Library of Congress/AP

Top: The 93rd New York Infantry's drum corps taken between August 1863 and November 1863.

Bottom: Union reenactors march by Confederates during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg, at Bushey Farm in Gettysburg, Pa., June 28, 2013.

Credit: Timothy H. O

Top: A sketch of the Union Army galloping into action on horseback at the Battle of Gettysburg, Pa, which took place July 1-3, 1863, during the American Civil War.

Bottom: Mounted Union reenactors take part in a demonstration of a battle during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 28, 2013.

Credit: U.S. Army Signal Corps/AP

Top: A painting by Edwin Forbes of the view from the summit of Little Round Top, July 3, 1863, in Gettysburg, Pa.

Bottom: Two reenactors view the sunrise during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 28, 2013.

Credit: AP

Top: John L. Burns, the "old hero of Gettysburg," with his gun and crutches in Gettysburg, Pa, July 1983. Burns, 69, a veteran of the War of 1812, joined the Union Army at the Battle of Gettysburg and became a national celebrity after he survived the battle and his wounds. President Abraham Lincoln met with Burns before delivering the "Gettysburg Address."

Bottom: A Florida man portrays a wounded soldier from the 1st N.C. Infantry as part of a demonstration of a Confederate field hospital during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 28, 2013.

Credit: Timothy H. O'Sullivan/Library of Congress/AP

Top: A sketch by combat artist Lt. Alfred R. Waudof shows soldiers in camp at night between 1860 and 1865.

Bottom: Reenactors portray Union soldiers in the Murray's Brigade cooking their rations during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 27, 2013.

Credit: Library of Congress/AP

Top: A sketch of the field hospital headquarters at the Battle of Gettysburg in July 1863.

Bottom: Members of the Union Murray's Brigade setting up camp during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.

Bottom: Reenactors demonstrate a cavalry battle near spectators during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 29, 2013.